G4QuasiFreeRatios.hh

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00027 // GEANT4 tag $Name: not supported by cvs2svn $
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00029 //
00030 // GEANT4 physics class: G4QuasiFreeRatios -- header file
00031 // M.V. Kossov, ITEP(Moscow), 24-OCT-01
00032 // The last update: M.V. Kossov, CERN/ITEP (Moscow) 28-Oct-2011
00033 // ----------------------------------------------------------------------
00034 // Short description: Provides percentage of quasi-free and quasi-elastic
00035 // reactions in the inelastic reactions.
00036 // ----------------------------------------------------------------------
00037 
00038 #ifndef G4QuasiFreeRatios_h
00039 #define G4QuasiFreeRatios_h 1
00040 
00041 #include "globals.hh"
00042 #include "G4ios.hh"
00043 #include "Randomize.hh"
00044 #include <vector>
00045 #include "G4QPDGCode.hh"
00046 #include "G4QHadron.hh"
00047 #include "G4QFreeScattering.hh"
00048 #include "G4QProtonElasticCrossSection.hh"
00049 #include "G4QNeutronElasticCrossSection.hh"
00050 
00051 
00052 class G4QuasiFreeRatios
00053 {
00054  protected:
00055 
00056   G4QuasiFreeRatios();                 // Constructor
00057 
00058  public:
00059 
00060   ~G4QuasiFreeRatios();                 // Destructor
00061 
00062   static G4QuasiFreeRatios* GetPointer(); // Gives a pointer to this singletone
00063 
00064   // Pair(QuasiFree/Inelastic,QuasiElastic/QuasiFree)
00065   std::pair<G4double,G4double> GetRatios(G4double pIU, G4int prPDG, G4int tgZ, G4int tgN);
00066   // ChargeExchange/QuasiElastic factor pair<for protons (Z), for neutrons(N)>
00067   std::pair<G4double,G4double> GetChExFactor(G4double pIU, G4int pPDG, G4int Z, G4int N);
00068   // scatter (pPDG,p4M) on a virtual nucleon (NPDG,N4M), result: final pair(newN4M,newp4M)
00069   // if(newN4M.e()==0.) - below threshold, XS=0, no scattering of the projectile happened
00070   std::pair<G4LorentzVector,G4LorentzVector> Scatter(G4int NPDG, G4LorentzVector N4M,
00071                                                      G4int pPDG, G4LorentzVector p4M);
00072   // ChExer (pPDG,p4M) on a virtual nucleon (NPDG,N4M), result: final pair(newN4M,newp4M)
00073   // if(newN4M.e()==0.) - keep projectile, XS=0, no interaction of the progectile happened
00074   // User should himself change the charge (PDG) (e.g. pn->np, pi+n->pi0p, pi-p->pi0n etc.)
00075   // Recepy: change target n to p or taget p to n and conserve enrgy, changing projectile
00076   // Do not use for the nucleon, as it is already included in quasielastic, and for pi0.
00077   std::pair<G4LorentzVector,G4LorentzVector> ChExer(G4int NPDG, G4LorentzVector N4M,
00078                                                     G4int pPDG, G4LorentzVector p4M);
00079   // Mean hN El and Tot XS(IU) for the isotopic (Z,N): on p -> (Z=1,N=0), on n -> (Z=0,N=1)
00080   std::pair<G4double,G4double> GetElTot(G4double pIU, G4int hPDG, G4int Z, G4int N); //(IU)
00081 
00082   // Calculate ChEx/El ratio coefficient (p is in independent units, (Z,N) is a target)
00083   G4double ChExElCoef(G4double p, G4int Z, G4int N, G4int pPDG);
00084 
00085   // For hadron PDG with momentum Mom (GeV/c) on F(p/n) calculate <sig_el,sig_tot> pair(mb)
00086   // F=true corresponds to the Nroton target, F=false corresponds to the Proton target
00087   std::pair<G4double,G4double> GetElTotXS(G4double Mom, G4int PDG, G4bool F);//<sigEl,sigT>
00088 
00089  private:
00090   // These working member functions are in CHIPS units and must not be used externally
00091   G4double GetQF2IN_Ratio(G4double TotCS_mb, G4int A); // QuasiFree/Inelastic (fast)
00092   G4double CalcQF2IN_Ratio(G4double TCSmb, G4int A); // R=QuasuFree/Inelastic (sig_t in mb)
00093 
00094  // Body
00095  private:
00096   G4QFreeScattering* QFreeScat;         // Source of quasi-free scattering XS
00097   static std::vector<G4double*> vT;     // Vector of pointers to LinTable
00098   static std::vector<G4double*> vL;     // Vector of pointers to LogTable
00099 };
00100 #endif

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